Charles t



C. F. DILKS.

TENSION TES'TING DEVICE FOR SEWING MACHINE THREADS.

APPLICATION FILED 0CI.3.- I917.

i 3G5, 780 Patenreu J 111163, 1919.

f fiwempwa HE?! 515111933335, ASSIGNGR C ONE-HALF. TO I. W.

GOLXEBEEG i "BRIDGETGN, NEW JERSEY.

TENSEQILTESTEEG DEVICE F5315, SEW'IHG l-Iififiliffifi THREADS.

Application filed October 3,

fio (1Z5 whom it may concern:

Tie known that I, F. oiiaizen of she .llnited Ssstes, residing in Bridge-ton, Qniniieriand county, Newjersey, have invenied improved Tension-(idiom Devices for Sewing-hdeohine Tine-eds, of which i eijzifieetien.

The ohjeeiof 1. yinven I i'ovide simpie lienddevip sieving controlled ineiniier "to he in hooked engagenoent with the thread of s machine to sscei'ssin the tension thereof, and to enebie the operator is reguiee the tension the of such thread with respect to e scale which my improved tension testing device carries.

ihe

ient feeiui'es of my invention may i .ed in devices 01" various forms, hove illness-seed, and these iis of 13/ invention. are more fully d'eso: hereinefteif, i'eferenee losing lied to e seoonipenying drawings, in

whim:

Figure 1 is s, perspeoeive View showing one form of my improved tension nesting position usein eonneetion with J machine; she letter d by broken lines.

fees "View of the device shown orm of tension fleeting en- *eion. 1

F of the structure shown in Pei'enseii June :3, i iii.

E913. Serial lilo. 134%,539.

eeied end ascertained by observing the posi- *eion' of'snid arm with respect to the scale, Wliieii may have its markings numbered in oedei" time the tension regulation may be faoiiitated.

li ianinnistion of ihe usual tension coniroiiing devices of the sewing machine will ihen be effected to increase or decrease the tension may be desired, to have it conform to the required tension for the Work in hand.

in Fig: fiend L, I have shown a modified conssrueeion, in which l indicai'es the main supporting her of a substantially L-shaped seruetui'e having an arm 8 preferably curved in the of e circle struck from she pivot point 9 of e movable arm 10 having a point- 7 ed end 13 disposed adjacent sosle markings 12 on the'si m 8; the latter being provided with e. sing: E3 to engage the arm 10, when the letter is the zero point. To hold the movable em at the zero position and to render the same active to indicaee tension on e thread, 1 provide a, spring 15in engegemeni with the same, which. may be formed by partially slitting the metelat the side of the arm 1 and bending. the some out therefrom to form a. oueved arm under tension; lying in engagement with a. projeetion is on the movable arm 10.

The arm 10 is provided with a hook 17 for engagement with the thread; such hook ioeing disposed above the pointer 11 adjecent the whereby the latter may be mad. linthe strueeure shown in Figs. 6 and .8, the move-ole arm 10 is provided with a. hooked end 6 extending beyond the Curved mm. 3, and die pointer 11 may be a. separate piece esii'ied iiiere oy and overlying the scale in the insnner indicarted in Fig. 6, and forming" with the arm 10 the means for kee ,in the latter in 0 era-five osition with reference to the scale arm 8.

in the structure shown in Figs. 7 and 9, the movable erm 1O may extend Wholly over the arm 8 carrying the scale; being out out at 18 so that the scale markings may be rezidiiy oiiserved. This structure has a guard beneath the arm 10 to keep it in opei'zieive position with reference to the scale like the device shown in Figs. 3 and i, and is preferably provided with a hooked end 6 like the device shown in 6 and 8.

claim:

1. An impro ed thread tension testing device consisting of a. relativelythin fiat plate fashioned With a segment atone end; said segment being provided with a scale, and a separate spring tensioned arm secured to the end portion of the plate opposite to said segment, the point of attachment of the spring tensioned arm being substantially the center from which the segment is struck, said spring tensioned arm being normally inclined relatively to the inclined side of the plate and having an open hook to readily receive the thread.

2. An improved thread tension testing device consisting of a unitary relatively thin fiat plate fashioned With a segment at one end; said segment being provided with a scale, secured to the end portion of the plate'opposit'e to saidsegment, the point of attachment of the spring tensioned arm being substantially the center from which the segment anda separate spring tensioned arm is struck, said spring tensioned arm being normally inclined relatively to the inclined side of the plate and having an open hook to readily receive the thread, and a guard adjacent the scale for said spring tensioned arm.

CHARLES F. DILKS. 

